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IN-LINE CLEANING
50
The cleaning feature allows an automatic cleaning action of
the electrodes . To perform cleaning, the controller activates
an external device (pump) .
Cleaning can be of two types:
• Simple cleaning: with water only, it can be triggered only
by a timer (periodical cleaning) or by an error for which
a cleaning action can be configured (i .e .a "Reference
electrode broken or dirty" error) .
• Advanced cleaning (optional): with water and detergent,
it can be triggered by the following events:
• timer (setup item L .15 set to "ti");
• digital input or RS485 command (external trigger; setup
item L .15 set to "E");
• timer and digital input or RS485 command (external
trigger; setup item L .15 set to "ti E");
• timer masked by external digital input (an external
digital input disables the cleaning; setup item L .15 set to
"tiEM");
• error for which a cleaning action is configured (i .e . a
"Reference electrode broken or dirty" error) .
The type of cleaning action is selected through the relays
configuration and the time between two consequent clean-
ing (if timer configured) has to be set through setup item
L .01 for simple cleaning and L .13 for advanced cleaning .
Cleaning actions do never take place if no relay is config-
ured for cleaning . The advanced cleaning requires both
relays 3 and 4 configured for that kind of cleaning: relay 3 is
associated with water and relay 4 corresponds to detergent .
A minimum pause time has to be set for advanced cleaning
(setup item L .14) to avoid continuous cleaning due to the
external trigger . A cleaning action with detergent can be
followed by one or more actions without detergent, when
desired .
Simple cleaning actions are performed in the following
order:
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